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Click on map to open large map in new window (Map updated: 11 August 2009)

Click here to view an interactive map of the Northern Ireland dataset as currently collated by CEDaR.The map is generated through the NBN Gateway using their Interactive Mapping Tool.

This crustose species (the classic ‘scripture’ lichen) has a thin, white or grey, smooth to wrinkled thallus. The unfurrowed, black, worm-like discs (lirellae) are variably arranged, sometimes in parallel rows but more often as a mixed frieze of evenly spaced, curved or inverted, single or double-looped shapes (like a miniature collage scattered evenly over a white canvas) the ends tapering to a point. Each has a central slit which, when fully expanded, may be faintly frosted over with a thin layer of white pruina. Common on tree twigs, branches and trunks.